> I heard microchip had done an AP note for dtmf detection based on 1 bit
> FFT. Correlation occurs and the bin values get increased. When at a
> preset level you have a match. The tones are stored in ram in tables and
> are used to check against.
> Scott

Yeah, but in this case the DTMF/Caller ID is being done in the PC. Lots more
horsepower available to 'do it right'.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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